/*
 * Copyright (C) 2005 - 2013 MaNGOS <http://www.getmangos.com/>
 *
 * Copyright (C) 2008 - 2013 Trinity <http://www.trinitycore.org/>
 *
 * Copyright (C) 2010 - 2013 ArkCORE <http://www.arkania.net/>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef ARKCORE_OBJECTACCESSOR_H
#define ARKCORE_OBJECTACCESSOR_H

#include "Define.h"
#include <ace/Singleton.h>
#include <ace/Thread_Mutex.h>
#include "UnorderedMap.h"

#include "UpdateData.h"

#include "GridDefines.h"
#include "Object.h"
#include "Player.h"

#include <set>

class Creature;
class Corpse;
class Unit;
class GameObject;
class DynamicObject;
class WorldObject;
class Vehicle;
class Map;
class WorldRunnable;

template<class T>
class HashMapHolder
{
public:

    typedef UNORDERED_MAP<uint64, T*> MapType;
    typedef ACE_Thread_Mutex LockType;

    static void Insert(T* o)
    {
        ACE_GUARD(LockType, Guard, i_lock);
        m_objectMap[o->GetGUID()] = o;
    }

    static void Remove(T* o)
    {
        ACE_GUARD(LockType, Guard, i_lock);
        m_objectMap.erase(o->GetGUID());
    }

    static T* Find(uint64 guid)
    {
        ACE_GUARD_RETURN(LockType, Guard, i_lock, NULL);
        typename MapType::iterator itr = m_objectMap.find(guid);
        return (itr != m_objectMap.end()) ? itr->second : NULL;
    }

    static MapType& GetContainer()
    {   return m_objectMap;}

    static LockType* GetLock()
    {   return &i_lock;}

private:

    //Non instanceable only static
    HashMapHolder()
    {}

    static LockType i_lock;
    static MapType m_objectMap;
};

class ObjectAccessor
{
    friend class ACE_Singleton<ObjectAccessor, ACE_Thread_Mutex> ;
    friend class WorldRunnable;
    ObjectAccessor ();
    ~ObjectAccessor ();
    ObjectAccessor (const ObjectAccessor&);
    ObjectAccessor& operator= (const ObjectAccessor&);

public:

    typedef UNORDERED_MAP<uint64, Corpse*> Player2CorpsesMapType;
    typedef UNORDERED_MAP<Player*, UpdateData>::value_type UpdateDataValueType;

    // TODO: override these template functions for each holder type and add assertions

    template<class T> static T* GetObjectInOrOutOfWorld(uint64 guid, T* /*typeSpecifier*/)
    {
        return HashMapHolder<T>::Find(guid);
    }
    static Unit* GetObjectInOrOutOfWorld(uint64 guid, Unit* /*typeSpecifier*/)
    {
        if (IS_PLAYER_GUID(guid))
        return (Unit*)GetObjectInOrOutOfWorld(guid, (Player*)NULL);

        if (IS_PET_GUID(guid))
        return (Unit*)GetObjectInOrOutOfWorld(guid, (Pet*)NULL);

        return (Unit*)GetObjectInOrOutOfWorld(guid, (Creature*)NULL);
    }

    // returns object if is in world
    template<class T> static T* GetObjectInWorld(uint64 guid, T* /*typeSpecifier*/)
    {
        return HashMapHolder<T>::Find(guid);
    }

    // Player may be not in world while in ObjectAccessor
    static Player* GetObjectInWorld(uint64 guid, Player* /*typeSpecifier*/)
    {
        Player * player = HashMapHolder<Player>::Find(guid);
        if (player && player->IsInWorld())
        return player;
        return NULL;
    }

    static Unit* GetObjectInWorld(uint64 guid, Unit* /*typeSpecifier*/)
    {
        if (IS_PLAYER_GUID(guid))
        return (Unit*)GetObjectInWorld(guid, (Player*)NULL);

        if (IS_PET_GUID(guid))
        return (Unit*)GetObjectInWorld(guid, (Pet*)NULL);

        return (Unit*)GetObjectInWorld(guid, (Creature*)NULL);
    }

    // returns object if is in map
    template<class T> static T* GetObjectInMap(uint64 guid, Map * map, T* /*typeSpecifier*/)
    {
        ASSERT(map);
        if (T * obj = GetObjectInWorld(guid, (T*)NULL))
        if (obj->GetMap() == map)
        return obj;
        return NULL;
    }

    template<class T> static T* GetObjectInWorld(uint32 mapid, float x, float y, uint64 guid, T* /*fake*/)
    {
        T* obj = HashMapHolder<T>::Find(guid);
        if (!obj || obj->GetMapId() != mapid)
        return NULL;

        CellPair p = Trinity::ComputeCellPair(x, y);
        if (p.x_coord >= TOTAL_NUMBER_OF_CELLS_PER_MAP || p.y_coord >= TOTAL_NUMBER_OF_CELLS_PER_MAP)
        {
            sLog->outError("ObjectAccessor::GetObjectInWorld: invalid coordinates supplied X:%f Y:%f grid cell [%u:%u]", x, y, p.x_coord, p.y_coord);
            return NULL;
        }

        CellPair q = Trinity::ComputeCellPair(obj->GetPositionX(), obj->GetPositionY());
        if (q.x_coord >= TOTAL_NUMBER_OF_CELLS_PER_MAP || q.y_coord >= TOTAL_NUMBER_OF_CELLS_PER_MAP)
        {
            sLog->outError("ObjectAccessor::GetObjecInWorld: object (GUID: %u TypeId: %u) has invalid coordinates X:%f Y:%f grid cell [%u:%u]", obj->GetGUIDLow(), obj->GetTypeId(), obj->GetPositionX(), obj->GetPositionY(), q.x_coord, q.y_coord);
            return NULL;
        }

        int32 dx = int32(p.x_coord) - int32(q.x_coord);
        int32 dy = int32(p.y_coord) - int32(q.y_coord);

        if (dx > -2 && dx < 2 && dy > -2 && dy < 2)
        return obj;
        else
        return NULL;
    }

    // these functions return objects only if in map of specified object
    static WorldObject* GetWorldObject(WorldObject const&, uint64);
    static Object* GetObjectByTypeMask(WorldObject const&, uint64, uint32 typemask);
    static Corpse* GetCorpse(WorldObject const& u, uint64 guid);
    static GameObject* GetGameObject(WorldObject const& u, uint64 guid);
    static DynamicObject* GetDynamicObject(WorldObject const& u, uint64 guid);
    static Unit* GetUnit(WorldObject const&, uint64 guid);
    static Creature* GetCreature(WorldObject const& u, uint64 guid);
    static Pet* GetPet(WorldObject const&, uint64 guid);
    static Player* GetPlayer(WorldObject const&, uint64 guid);
    static Creature* GetCreatureOrPetOrVehicle(WorldObject const&, uint64);

    // these functions return objects if found in whole world
    // ACCESS LIKE THAT IS NOT THREAD SAFE
    static Pet * FindPet(uint64);
    static Player* FindPlayer(uint64);
    static Unit* FindUnit(uint64);
    Player* FindPlayerByName(const char* name);

    // when using this, you must use the hashmapholder's lock
    HashMapHolder<Player>::MapType& GetPlayers()
    {
        return HashMapHolder<Player>::GetContainer();
    }

    // when using this, you must use the hashmapholder's lock
    HashMapHolder<Creature>::MapType& GetCreatures()
    {
        return HashMapHolder<Creature>::GetContainer();
    }

    // when using this, you must use the hashmapholder's lock
    HashMapHolder<GameObject>::MapType& GetGameObjects()
    {
        return HashMapHolder<GameObject>::GetContainer();
    }

    template<class T> void AddObject(T* object)
    {
        HashMapHolder<T>::Insert(object);
    }

    template<class T> void RemoveObject(T* object)
    {
        HashMapHolder<T>::Remove(object);
    }

    void RemoveObject(Player* pl)
    {
        HashMapHolder<Player>::Remove(pl);
        RemoveUpdateObject((Object*)pl);
    }

    void SaveAllPlayers();

    void AddUpdateObject(Object* obj)
    {
        ACE_GUARD(LockType, Guard, i_updateGuard);
        i_objects.insert(obj);
    }

    void RemoveUpdateObject(Object* obj)
    {
        ACE_GUARD(LockType, Guard, i_updateGuard);
        i_objects.erase(obj);
    }

    void Update(uint32 diff);

    Corpse* GetCorpseForPlayerGUID(uint64 guid);
    void RemoveCorpse(Corpse* corpse);
    void AddCorpse(Corpse* corpse);
    void AddCorpsesToGrid(GridPair const& gridpair, GridType& grid, Map* map);
    Corpse* ConvertCorpseForPlayer(uint64 player_guid, bool insignia = false);
    void RemoveOldCorpses();

    typedef ACE_Thread_Mutex LockType;

protected:
    void UnloadAll();

private:

    Player2CorpsesMapType i_player2corpse;

    static void _buildChangeObjectForPlayer(WorldObject*, UpdateDataMapType&);
    static void _buildPacket(Player*, Object*, UpdateDataMapType&);
    void _update();

    std::set<Object*> i_objects;

    LockType i_updateGuard;
    LockType i_corpseGuard;
};

#define sObjectAccessor ACE_Singleton<ObjectAccessor, ACE_Thread_Mutex>::instance()
#endif
